Quote Originally Posted by gainer View Post
The basic guidelines of Technical grade borax powder are well known,
Well known? - didn't you just point out that there are two different specs for the same grade of borax? Granular and powder - both called Technical Grade, have differing specs?? That's pretty precise!

Also, you say,
Quote Originally Posted by gainer View Post
Let me point out that the highest grades I have seen specified by Rio Tinto and others guarantee the sodium tetraborate decahydrate equivalent to be between 99.9 and 105 or even 110 %.
That's not the highest grade that you have seen. Technical grade is usually considered the lowest grade. Surely you read the assay that Mick listed for the results of his ACS Analyzed Reagent Grade Borax - it listed "Assay = 99.101%". http://www.apug.org/forums/forum37/4...tml#post556946

Let's think about that for a second to let it sink in... One grade has a precision of 5 digits, the other grade has a precision of 10%. Now which one should we consider to be the higher grade? I hope you answered this one by saying "AR Grade" to yourself.